MG5 Scripting shower=pythia8 not recognised!!

I have two scripts, one for running MG5 initially, and the other with all the commands. HOWEVER, the ’shower=pythia8’ command is not being recognised by mg5 when scripting, all the others are but this is of course essential to the jobs - how do I fix this?

1st script to run mg5

#! /bin/bash

echo “Loading MG5 …”

~/SFNP/MG5_aMC_v2_7_2/bin/mg5_aMC -f mg5script.sh

2nd Script with all commands within mg5 (commented out the import model for quicker run checks of the script)

#import model SM_LT012_UFO-SMlimit_FT0

generate p p > Z Z j j QCD==0

output ZZ_test

launch ZZ_test

shower=pythia8

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set nevents 100

set ebeam1 7000

set ebeam2 7000

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